get_upload_iframe_src

	/**
	 * Filters the legacy (pre-3.5.0) media buttons.
	 *
	 * Use {@see 'media_buttons'} action instead.
	 *
	 * @since 2.5.0
	 * @deprecated 3.5.0 Use {@see 'media_buttons'} action instead.
	 *
	 * @param string $string Media buttons context. Default empty.
	 */
	$legacy_filter = apply_filters_deprecated( 'media_buttons_context', array( '' ), '3.5.0', 'media_buttons' );

	if ( $legacy_filter ) {
		// #WP22559. Close <a> if a plugin started by closing <a> to open their own <a> tag.
		if ( 0 === stripos( trim( $legacy_filter ), '</a>' ) ) {
			$legacy_filter .= '</a>';
		}
		echo $legacy_filter;
	}
}

/**
 * @global int $post_ID
 * @param string $type
 * @param int    $post_id
 * @param string $tab
 * @return string
 */
function get_upload_iframe_src( $type = null, $post_id = null, $tab = null ) {
	global $post_ID;